What is the most expensive substance in your world? | Worldbuilding Prompts | World Anvil

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A substance could be most expensive by weight, or by volume, or maybe value is measured in the amount of souls needed to create it? Think also about its storage: does it require any special considerations (apart from security) to keep this stuff contained? Antimatter, for example, can't touch any normal matter or it will blow up.

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brass_phoenix

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